Maintaining BiV pacing

Question 1

What is the standard setting for the Max trigger rate?

Answer 1

Upper track rate +20 / 160bpm / VT1 zone

Question 2

What does LV T-wave protection do?

Answer 2

LV sense restarts the max trigger rate - pushing the RV event past the T-wave of the LV

Question 3

What is and how does Negative Hysteresis work?

Answer 3

Shortens AV delay when a sensed R-wave occurs for 5 repetitive cycles in default setting

Question 4

How do negative hysteresis and AV opt differ

Answer 4

Av opt encourages fusion - Negative hysteresis wants to pace

Question 5

Why should your upper trigger rate be shorter than your max track rate?

Answer 5

To avoid trigger rate lock in - BiV is more effective than triggered pacing

Question 6

BiV pacing is 100% dependent on A tracking - true/false

Answer 6

True - Shit A = Shit CRT

Question 7

Best LV lead position is when IVCD is maximal - True/False

Answer 7

TRUE

Question 8

What is the trigger pacing delay?

Answer 8

20ms

Question 9

How long is the AV control window and what does it do?

Answer 9

350msec up to 600msec

Distinguishes true A to V vs PVC. Any A event with a V following within the programmed time is considered linked and a true beat, not PVC

Question 10

How to distinguish PVARP Lock in vs Max Trigger Lock in

Answer 10

PVARP = As (PVARP) > PVC > Delayed LVs

Max Trig = As > Rvp > Delayed LVs

Question 11

Whats a good Max Trigger length?

Answer 11

400msec - keep it short

Question 12

List some desynchronising events

Answer 12

A rate > UTR
PVC
PAC
TWOs
Under sensing